The villagers had never seen anything like it before. Many tanks, armoured cars, trucks and cannons of the First Polish Armoured Division landed in the village. This made Koewacht the first village in Zeeland to be liberated. In the course of the day most other villages south of the Axel-Hulst line would also fall into Allied hands. The Poles advanced from Koewacht with the aim of breaking the German resistance around Axel and advancing towards the port of Terneuzen.
The advance was accompanied by heavy artillery shelling. What started as a simple border crossing developed around Axel into a fierce battle with many casualties on the Polish side. During this fighting at Fort Ferdinandus Jan Gasiorowski was killed. He is buried in the cemetery to the left of the Catholic church. It was not until 20 September that the Poles reached Terneuzen and were able to take the town and its harbours.